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Anode and battery

a technology applied in the field of anode and battery, can solve the problems of difficult to achieve a vastly high capacity, reducing cycle characteristics, and reducing so as to prevent shape deformation or the like reduce the internal resistance of the anode active material layer, and reduce the stress concentration

Active Publication Date: 2011-05-17
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an anode and a battery using the anode that can relax stress, improve cycle characteristics, and prevent swelling. The anode has a metal element increasing and decreasing region in which the metal element is contained as an element, and the concentration of the metal element is increased and then decreased in a thickness direction. This decreases the internal resistance of the anode active material layer, allows for easy insertion of the electrode reactant, and prevents deformation of the anode current collector and shape deformation of the anode active material layer. The battery using the anode has improved cycle characteristics and prevents swollening. The metal element can be titanium, chromium, iron, cobalt, nickel, or zirconium, and the anode active material layer can further contain oxygen or have a high oxygen region and a low oxygen region. The metal element can bond to oxygen to form an oxide, which facilitates uniform insertion of the electrode reactant.

Problems solved by technology

However, since graphite is used for the anode in the lithium ion secondary battery in practical use currently, the battery capacity thereof is in a saturated state and thus it is difficult to attain a vastly high capacity thereof.
Thus, it has been problematic that the cycle characteristics are lowered due to pulverization.
However, even in the anode in which the anode current collector and the anode active material layer are integrated, when charge and discharge are repeated, the anode active material layer is intensely expanded and shrunk.
Further, the anode current collector is deformed due to the stress of the expansion and shrinkage, and thus the battery is swollen.

Method used

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Experimental program
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first embodiment

[0026]FIG. 1 shows a structure of a secondary battery according to a first embodiment of the invention. The secondary battery is a so-called square type battery, and has a battery element 20 inside a battery can 11 in the shape of an approximately hollow cylinder. The battery can 11 is a metal container, and is made of, for example, aluminum (Al), an aluminum alloy, nickel, a nickel alloy, iron, or an iron alloy. The surface of the battery can 11 may be plated, or coated with a resin or the like. Inside the battery can 11, a pair of insulating plates 12 and 13 is arranged so that the battery element 20 is sandwiched between the insulating plates 12 and 13. One end of the battery can 11 is closed, and the other end thereof is opened. The open end of the battery can 11 is sealed with a battery cover 14. A terminal pin 16 is provided for the battery cover 14 with an insulating member 15 in between. The battery cover 14 and the terminal pin 16 are made of, for example, a metal material ...

second embodiment

[0061]FIG. 5 shows a structure of a secondary battery according to a second embodiment of the invention. In the secondary battery, a battery element 30 on which leads 31 and 32 are attached is contained inside a film package member 40. The leads 31 and 32 are respectively made of, for example, a metal material such as aluminum, copper, nickel, and stainless. The leads 31 and 32 are respectively directed from inside to outside of the package member 40 and derived in the same direction, for example.

[0062]The package member 40 is made of a rectangular aluminum laminated film in which, for example, a nylon film, an aluminum foil, and a polyethylene film are bonded together in this order. The package member 40 is, for example, arranged so that the polyethylene film side and the battery element 30 face each other, and the respective outer edges are contacted to each other by fusion bonding or an adhesive. Adhesive films 41 to protect from entering of outside air are inserted between the p...

examples

[0069]Further, specific examples of the invention will be hereinafter described in detail with reference to the drawings.

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Abstract

An anode capable of relaxing the stress concentration and improving the characteristics and a battery using it are provided. The anode includes an anode current collector and an anode active material layer containing silicon (Si) as an element, wherein an anode active material layer has a metal element increasing and decreasing region in which a metal element is contained as an element, and a concentration of the metal element is increased and then decreased in a thickness direction.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]The present invention contains subject matter related to Japanese Patent Application JP 2006-077074 filed in the Japanese Patent Office on Mar. 20, 2006, the entire contents of which being incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an anode containing silicon (Si) as an element and a battery using the anode.[0004]2. Description of the Related Art[0005]In recent years, as mobile devices have been sophisticated and multi-functionalized, the higher capacity of secondary batteries as a power source for these mobile devices has been demanded. As a secondary battery to meet such a demand, there is a lithium ion secondary battery. However, since graphite is used for the anode in the lithium ion secondary battery in practical use currently, the battery capacity thereof is in a saturated state and thus it is difficult to attain a vastly high capacity thereof. T...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M4/62H01M4/02H01M4/134H01M4/1395H01M4/70H01M10/05
CPCH01M4/0421H01M4/364H01M4/38H01M10/0525H01M4/366H01M4/134Y02E60/122H01M4/386Y02E60/10H01M4/02H01M4/58H01M10/05
Inventor HIROSE, TAKAKAZUIWAMA, MASAYUKIMATSUMOTO, KOICHIKONISHIIKE, ISAMUKAWASE, KENICHI
Owner MURATA MFG CO LTD